Solution
Note that Xilinx Compilation Tools – ISE 14.7 is automatically selected when we select LabVIEW 2018 FPGA for installation during the select installations page of the wizard. In order to avoid above errors, follow these steps:
1. Select Xilinx Compilation Tools - ISE 14.7 for LabVIEW 2018
2. Select Do not install Xilinx Compilation Tools – ISE 14.7
3. A window asking if you want to deselect the dependent products comes up, select No.
4. You can now click Next and proceed in installing LabVIEW 2018 FPGA.